Laser module and assembly method therefor

Abstract

The present invention provides a laser module and an assembly method therefor. The laser module is mainly consisted of a lens module configured to be installed in an inner cavity of the height adjustment barrel through an end of the height adjustment barrel and a heat sink threadingly connected with another end of the height adjustment barrel. The laser module is configured in such a manner that a laser diode received in an inner cavity of the heat sink and a lens accommodated within the lens module are aligned along a same optical axis, and the height adjustment barrel is configured to adjust a focal length between the laser diode and the lens.

The invention claimed is: 
     
       1. A laser module, wherein a heat sink and a lens module are configured to be installed in an inner cavity of a height adjustment barrel through two ends of the height adjustment barrel, respectively, such that a laser diode received in an inner cavity of the heat sink and a lens accommodated within the lens module are disposed on a same optical axis, and the height adjustment barrel is configured to adjust a focal length between the laser diode and the lens, wherein the lens module is consisted of a lamp body, and of a transparent protective plate covering an opening end of a lens holder, a light diffusion plate, the lens holder, a lens embedded at a bottom portion of the lens holder, and a hold-down ring, which are disposed in an inner cavity of the lamp body in sequence. 
     
     
       2. The laser module according to  claim 1 , wherein a bottom portion of an inner wall of the lens holder is recessed to form an annular mounting groove, a bottom portion of the lens is formed with an annular stepped portion, and the stepped portion of the lens is engaged in the mounting groove of the lens holder. 
     
     
       3. The laser module according to  claim 1 , wherein the height adjustment barrel and the heat sink are threadingly connected. 
     
     
       4. The laser module according to  claim 1 , wherein an inner wall of the height adjustment barrel, at a position where the lens module is disposed, is recessed to form an annular groove, an outer circumferential wall of the lamp body, at a position corresponding to the annular groove of the height adjustment barrel, protrudes to form a protruding annular portion, and the protruding annular portion of the lamp body is engaged in the annular groove of the height adjustment barrel, such that the lamp body is fixedly arranged in the height adjustment barrel. 
     
     
       5. The laser module according to  claim 1 , wherein the hold-down ring, which is disposed on a side of the lens holder, has an outer circumferential wall protruding to form an arc-shaped protruding annular ridge, an annular recess is formed at a corresponding position on an inner wall of the lamp body, and the protruding annular ridge of the hold-down ring is engaged in the annular recess of the lamp body such that the hold-down ring is fixedly arranged on the lamp body. 
     
     
       6. The laser module according to  claim 1 , wherein the heat sink is consisted of a sleeve, a stepped portion radially extending at an end of the sleeve, an inner shoulder formed with a decreased diameter at a middle portion of the sleeve, and a laser diode accommodation cavity formed with an increasing diameter at a portion of the inner shoulder proximal to the stepped portion. 
     
     
       7. The laser module according to  claim 6 , wherein the stepped portion of the heat sink is provided with a screw hole extending in parallel with an axis. 
     
     
       8. A method for assembling a laser module, wherein the method comprises steps as follows:
 installing a transparent protective plate, a light diffusion plate, a lens holder, a lens, and a hold-down ring in an inner cavity of a lamp body in sequence, wherein a protruding annular ridge of the hold-down ring is engaged in an annular recess of the lamp body, such that the hold-down ring is fixedly arranged on the lamp body to assemble a lens module; 
 installing the lens module through an end of the height adjustment barrel in such a manner that a protruding annular portion of the lamp body is engaged in an annular groove of the height adjustment barrel, such that the lens module is fixedly arranged in the height adjustment barrel; 
 pressing a laser diode into a heat sink, and threading external threads of the heat sink into internal threads of the height adjustment barrel; and 
 adjusting a focal length between the laser diode and the lens by threads, to achieve optimized illumination effect.